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Physical Quantities

Two point P...

Question

Two point $P_{1}$ and $P_{2}$ are at distances 'r' and 3r respectively from a point charge. What is the ratio of electric field intensities at these points $P_{1}$ and $P_{2}$ ?

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Solution

at $P_{1}$
$E_{1} = \frac{K Q}{r^{2}}$

at $P_{2}$

$E_{2} = \frac{K Q}{q r^{2}}$

$\Rightarrow \frac{E_{1}}{E_{2}} = 9 : 1$

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